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850 / S70 & V70 '96-'99 / C70 '97-'05 General Forum for the 850 and P80-platform 70-series models |
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Turbo Whoosh Noise on deceleratingViews : 2015 Replies : 18Users Viewing This Thread : |
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Jul 7th, 2018, 18:57 | #1 |
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Turbo Whoosh Noise on decelerating
As above. Turbo is Standard 16T on a 97 V70r - Stage 1 remap that boosted well to 13psi+. Over the last couple of days, it's started boosting to around 8psi only and a fairly audible whooshing/rush of air noise is heard on deceleration. It never did that before and it doesn't do it on acceleration, oddly. Is this a faulty wastegate or dump valve and why would that cause a loss of around 5-6 psi of boost pressure?? 🤔 TIA
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Jul 7th, 2018, 19:48 | #2 |
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Have you checked your vac lines? I had a pressure drop and a whoosh with a knackered vac line.
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1995 Volvo 850 T5 Estate (Manual) |
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Jul 7th, 2018, 21:54 | #3 |
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Could be a split in your recirculation valve.
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Jul 7th, 2018, 22:26 | #4 |
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Am checking it over Tuesday - just thought I'd get some opinions on what it might be!?? Where would I find the recirculation valve?? Never heard of that if Im honest...
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Jul 7th, 2018, 22:27 | #5 |
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Jul 7th, 2018, 22:55 | #6 |
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It's built into the turbo compressor housing, does a similar job to dump/blow off valves, it's not uncommon on these to fail. You can blank them off or replace it.
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Jul 7th, 2018, 23:17 | #7 |
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Mine was wastegate actuator.
Have a watch of this for more info on vac lines. https://www.youtube.com/watch?v=x8sXo5gbapM
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1995 Volvo 850 T5 Estate (Manual) Last edited by Cookeh; Jul 7th, 2018 at 23:20. |
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Jul 8th, 2018, 18:27 | #8 |
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I had the same symptoms with a split recirc valve
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2000 C70 T5 GT Coupe 1998 S70R / 1995 Toyota Supra Twin Turbo 2007 Mercedes CLS 320 CDI / 2011 Mercedes S350 Bluetec 2007 Suzuki GSXR-1000 |
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Jul 10th, 2018, 17:48 | #9 |
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So it needs two vac pipes on the turbo side. A wastegate solenoid, turbo to airbox pipe and we think idle control valve. Possibly also a top intercooler hose. All in all an expensive day, but worth every penny to restore the fun factor. Thanks for all the help!!
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Jul 11th, 2018, 18:29 | #10 |
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I've decided to replace the recirc valve diaphragm too, but I'm having trouble sourcing a new one for some reason. Is it Volvo only part?? Anyone got a link?? 🤔
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